# Filename : test24.py
# author by : www.snzigod.com

# 定义函数
def add(x, y):
    """相加"""

    return x + y


def subtract(x, y):
    """相减"""

    return x - y


def multiply(x, y):
    """相乘"""

    return x * y


def divide(x, y):
    """相除"""

    return x / y


# 用户输入
print("选择运算：")
print("1、相加")
print("2、相减")
print("3、相乘")
print("4、相除")

choice = input("输入你的选择(1/2/3/4):")

num1 = int(input("输入第一个数字: "))
num2 = int(input("输入第二个数字: "))

if choice == '1':
    print(num1, "+", num2, "=", add(num1, num2))

elif choice == '2':
    print(num1, "-", num2, "=", subtract(num1, num2))

elif choice == '3':
    print(num1, "*", num2, "=", multiply(num1, num2))

elif choice == '4':
    print(num1, "/", num2, "=", divide(num1, num2))
else:
    print("非法输入")
